Given this was our first time launching our boat and that we could have done it completely wrong. We backed the trailer down into the water as far as we could with the truck, attached the cable to the trailer and truck, then raised the trailer until it popped off of the ball and slid down the ramp. The boat just floated right off the trailer and they hauled the trailer out with the truck. I'm not entirely sure about the hauling out part because I was the one on the boat when it went in.
As far as hauling out, I have no idea. I'm not looking forward to doing that.
1971 Cal 25'